Dir::Tmpname.make_tmpname replaced by own method

lib/gnuplotrb.rb

@@ -19,6 +19,8 @@ def require_if_available(name)
 require 'gnuplotrb/external_classes/string'
 require 'gnuplotrb/external_classes/array'
 require 'gnuplotrb/external_classes/daru'
+require 'gnuplotrb/external_classes/dir'
+
 
 require 'gnuplotrb/version'
 require 'gnuplotrb/staff/settings'

lib/gnuplotrb/animation.rb

@@ -58,7 +58,7 @@ def plot(path = nil, **options)
         plot_opts.merge(term: ['gif', anim_opts])
       end.to_h
       need_output = plot_options[:output].nil?
-      plot_options[:output] = Dir::Tmpname.make_tmpname('anim', 0) if need_output
+      plot_options[:output] = Dir.gnuplot_tmpname('anim') if need_output
       terminal = Terminal.new
       multiplot(terminal, plot_options)
       # guaranteed wait for plotting to finish

lib/gnuplotrb/external_classes/dir.rb

@@ -0,0 +1,9 @@
+##
+# Utility methods for GnuplotRB.
+class Dir
+  # @return temporary file name
+  def self.gnuplot_tmpname(name)
+    t = Time.now.strftime('%Y%m%d')
+    "#{Dir.tmpdir}/gnuplotrb-#{name}-#{t}-#{$PID}-#{rand(0x100000000).to_s(36)}"
+  end
+end

lib/gnuplotrb/mixins/plottable.rb

@@ -110,7 +110,7 @@ def to_specific_term(terminal, path = nil, **options)
       if path
         result = plot(term: [terminal, options], output: path)
       else
-        path = Dir::Tmpname.make_tmpname(terminal, 0)
+        path = Dir.gnuplot_tmpname(terminal)
         plot(term: [terminal, options], output: path)
         result = File.binread(path)
         File.delete(path)

lib/gnuplotrb/staff/datablock.rb

@@ -13,7 +13,7 @@ def initialize(data, stored_in_file = false)
       @stored_in_file = stored_in_file
       data_str = data.to_gnuplot_points
       if @stored_in_file
-        @file_name = Dir::Tmpname.make_tmpname('tmp_data', 0)
+        @file_name = Dir.gnuplot_tmpname('tmp_data')
         File.write(@file_name, data_str)
         name = File.join(Dir.pwd, @file_name)
         ObjectSpace.define_finalizer(self, proc { File.delete(name) })